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(No Model.) 4 SheetsSheet 1.

H. SIMMONDS 85 J. DELANEY. KILL? 0R FURNACE FOR BURNING LIME.

No. 593.246. Patented Nov. 9, 1897.

(No Mudel.) 4 Sheets-Sheet 2. H. SIMMONDS 8; J. DELANEY. KILN 0R FURNACEFOR BURNING LIME.

593,246 Patented Nov. 9, 1897.

WH'NESS Fl G'.2.

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(No Model) 4 Sheets-$heet 3. H. SIM DS & J. LANEY.

r KILN 0R AGE FOR IME. No. 593,246.

Pat d Nov. 9, 1897.

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4 Sheets-Sheet 4. 8a J. DELANEY. FOR BURNING LIME.

Patented Nov. 9,1897.

H. S KILN No. 593,246.

AGE

\NVENTORS.

UNITED STATES PATENT OEEioE.

HENRY SIMMONDS, OF COLNE, AND JOHN DELANEY, OF HORTON, ENGLAND.

SPECIFICATION forming part of Letters Patent No. 593,246, dated November9, 1897.

Application filed January 21, 1896. Serial No.

676,342. (No model.) Patented in England April 11, 1895, No. 7,425, andFebruary 7, 1896,1l0. 2,843.

To all whom it may concern:

Be it known that we, HENRY SIMMONDS, a resident of Oolne, in the countyof Lancaster, and JOHN DELANEY, a resident of Horton, in Bibblesdale, inthe county of York, England, subjects of the Queen of Great Britain,have invented certain new and useful Improvements in Kilns or Furnacesfor Burning Lime and other Minerals, (for which we have obtained LettersPatent in Great Britain, No. 7,425, dated April 11, 1895, and No. 2,843,dated February 7, 1896,) of which the following is a specification.

This invention is designed to provide a furuses or kiln for the burningof mineral substances-such as limestone, ironstone, chalk, cement, orthe like-in which what is known as producer-gas or other gaseous fuelmay be used instead of or in conjunction with the ordinary solid fuel.

In the burning of lime it has hitherto been generally customary to fillor charge the kiln with alternate layers or charges of limestone andcoal or coke, the ash and residue or clinker from which deteriorated thequality of the lime with which they came in contact or with which theybecame mixed, and we consider that by the use of a gaseous fuel or alarge percentage of gaseous fuel a greater percentage of first-qualitylime will be produced at a much less cost and a greater output of limeper kiln per twenty-four hours, the lime containing considerably less ofimpurities-such as sulfur compounds, ash, and clinker, 850.

The invention refers to constructing the kiln or furnace with a chamberover the fuelinlet formed of a hollow bridge or arch with passages atboth sides or with a hollow hood extending from the sides and coveringthe inlet, a cooling-chamber below the combustion-chamber, gas-producersplaced at the sides of the cooling-chamber, and an air-supply orair-inlet placed so that heated air is delivered close to thefuel-inlet, which has been heated by the cooling lime.

The invention will be fully described with reference to the accompanyingdrawings.

Figure l is a front elevation. Fig. 2 is a sectional elevation on linesa: :0, Figs. 4 and 5. Fig. 3 is a sectional elevation on lines y y,

Figs. 4 and 5. Fig. 4 is a sectional plan on lines 2 2, Figs. 1 and 2.Fig. 5 is a plan.

In carrying out the invention we construct the kiln either verticalthroughout its whole length or inclined for part of its length, with twoparts or chambers-a bu rning-chamber A and a cooling-chamber B.

At the bottom of the burning-chamber A we place a bridge or arch 0,extending across the center of the kiln with a space or passage a, ateither side, and below this are placed the inlets D for the gaseousfuel.

The arch or bridge 0 is constructed with a cavity 0 on its under sidewhich forms a chamber beneath the arch into which the solid material asit passes down through the kiln cannot enter. In this chamber thecombustible gases are mixed with a sufficient quantity of air to promotevigorous combustion, and the heated products in an incandescent statespread out and pass up at both sides of the arch, there encountering thelimestone as it passes down through the passages a.

Below the hollow arch or bridge C is the cooling-chamber B, into whichthe lime at a White heat falls from the burning-chamber and graduallycools, being removed through apertures or openings 1) at the bottom.

One, two, or more gasproduoers E are affixed or built to the side of thecooling-chamber B of the kiln, being connected thereto by the inlet D,which opens into the chamber 0 below the hollow arch C. The producer Eis formed with a charging-orifice F at the top, closed by a door or lidf, and with a grate G at the bottom upon which coal, coke, or other fuelcapable of producing or generating combustible gases is heated. Belowthe grate is an ash-pan H, provided with a water-supply pipe h and awater-overflow pipe h. A supply of water is thereby kept in the ash-panH, from which steam is generated and passes up with the gases producedin the chamber of the producer through the inlet D into thecombustion-chamber. The steam generated in the ash-pan is converted intocarbonicoxid gas while passing through the incandescent coke and passesup with the gases, &c. A door K is placed in front of the grate G,through which the clinkers and ashes may be removed. This door isprovided with aper- E. By the use of solid fuel along with gaseous fuelWe find that the output of lime per ton of coal used is greatlyincreased.

The inlet D is regulated or opened or closed by a damper L, suspended bya chain land balance-Weight Z.

Air-inlet passages M are formed in the walls of the cooling-chamber B,through which a secondary supply of air is admitted to promote thecombustion of the gaseous fuel entering the kiln through the inlet D.The airpassages M are built into the walls of the kiln and follow azigzag or sinuous course to allow Of the air being heated to a hightemperature before entering the kiln. The air is delivered through anaperture m at the mouth of the inlet D, thereby becoming thoroughlymixed with the gases as they enter the chamber 0. The mouth or inlet tothe air-passage M is provided with a regulating door or damper N, bywhich the quantity of air entering can be regulated and controlled.

Additional air may be admitted, it required, through the cooling-chamberB at the openings b.

What We claim as our invention, and desire to protect by Letters Patent,is

1. In a kiln for burning limestone by gaseous fuel the combination withthe combustion-chamber A, arch O therein, chamber 0 beneath the arch andgas-fuel inlets D, the gas-producer E in which the gaseous fuel isgenerated connected to the combustion-chamher A by the fuel-inlets D, ofthe solid-fuel inlets D the sinuous air-passages M, the aperture m fromthe same into the inlets D to supply air to promote combustion beforeentering the kiln, the regulating-door N at the mouth of the air-passageM, and the sighthole d in the producer,as described and shown.

2. In a kiln for burning limestone by means of gaseous fuel thecombination with the com- 'bustion-chamber A, the arch O thrown acrossit, the chamber 0 formed beneath the arch, the gas-fuel inlets D leadingfrom the gasprodueer and opening into the chamber 0, the sinuousair-passages M opening into the inlets D to supply heated air to promotecombustion before entering the kiln and the regulating-door N at themouth of the air-passage M of the gas-producer E connected to the kilnby means of the inlets D, a grate G to receive the coke, an ash-pan H inwhich Water is evaporated to supply vapor to the coke, the water-supplypipe h and overflowpipe h connected to the ash-pan and the orifice F forcharging the apparatus with coke substantially as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing Witnesses.

HENRY SIMMONDS. JOHN DELANEY.

\Vitnesses IoWDEN OBRIEN, CHAS. OVENDALE.

